Let's say I have a file A.cpp, and I notice an error on line 15 of the file. Let's say the error is a "const" on a function that returns a pointer to a member variable, meaning using const on the function is technically correct but semantically wrong. I would like to discuss the semantics with the author who made the change.
Using git, is there a way to find out which revision introduced the "const" token? More specifically, I'd like to know who introduced the token.
"git blame" shows who made the last change to the line, but I would actually like to find the first commit containing the token.
git bisect is what you are looking for. With this command you can find quickly what commit introduced the const.
You start the process with git bisect start, then mark an old version without the const as good with git bisect good and and the current one as bisect bad. Then the system will send you to a version in the middle. You can check if the evil const is there, and mark that version good or bad depending on it. Then The process is repeated until you find the bad commit.